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lavfi: add aselect audio variant of select

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This commit is contained in:
Stefano Sabatini 2012-12-11 01:19:30 +01:00
parent 64c5fbd7de
commit f5461face5
6 changed files with 108 additions and 26 deletions
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1
Changelog
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@ -41,6 +41,7 @@ version <next>:
- VobSub demuxer
- JSON captions for TED talks decoding support
- SOX Resampler support in libswresample
- aselect filter
version 1.0:

20
doc/filters.texi
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@ -3506,7 +3506,7 @@ scale='min(500\, iw*3/2):-1'
@end example
@end itemize
@section select
@section aselect, select
Select frames to pass in output.
It accepts in input an expression, which is evaluated for each input
@ -3551,7 +3551,7 @@ the PTS of the first video frame in the video, NAN if undefined
@item start_t
the time of the first video frame in the video, NAN if undefined
@item pict_type
@item pict_type @emph{(video only)}
the type of the filtered frame, can assume one of the following
values:
@table @option
@ -3564,7 +3564,7 @@ values:
@item BI
@end table
@item interlace_type
@item interlace_type @emph{(video only)}
the frame interlace type, can assume one of the following values:
@table @option
@item PROGRESSIVE
@ -3575,6 +3575,15 @@ the frame is top-field-first
the frame is bottom-field-first
@end table
@item consumed_sample_n @emph{(audio only)}
the number of selected samples before the current frame
@item samples_n @emph{(audio only)}
the number of samples in the current frame
@item sample_rate @emph{(audio only)}
the input sample rate
@item key
1 if the filtered frame is a key-frame, 0 otherwise
@ -3582,7 +3591,7 @@ the frame is bottom-field-first
the position in the file of the filtered frame, -1 if the information
is not available (e.g. for synthetic video)
@item scene
@item scene @emph{(video only)}
value between 0 and 1 to indicate a new scene; a low value reflects a low
probability for the current frame to introduce a new scene, while a higher
value means the current frame is more likely to be one (see the example below)
@ -3617,6 +3626,9 @@ select='gte(t\,10)*lte(t\,20)*eq(pict_type\,I)'
# select frames with a minimum distance of 10 seconds
select='isnan(prev_selected_t)+gte(t-prev_selected_t\,10)'
# use aselect to select only audio frames with samples number > 100
aselect='gt(samples_n\,100)'
@end example
Complete example to create a mosaic of the first scenes:

1
libavfilter/Makefile
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@ -54,6 +54,7 @@ OBJS-$(CONFIG_AMERGE_FILTER) += af_amerge.o
OBJS-$(CONFIG_AMIX_FILTER) += af_amix.o
OBJS-$(CONFIG_ANULL_FILTER) += af_anull.o
OBJS-$(CONFIG_ARESAMPLE_FILTER) += af_aresample.o
OBJS-$(CONFIG_ASELECT_FILTER) += vf_select.o
OBJS-$(CONFIG_ASENDCMD_FILTER) += f_sendcmd.o
OBJS-$(CONFIG_ASETNSAMPLES_FILTER) += af_asetnsamples.o
OBJS-$(CONFIG_ASETPTS_FILTER) += f_setpts.o

1
libavfilter/allfilters.c
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@ -46,6 +46,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (AMIX, amix, af);
REGISTER_FILTER (ANULL, anull, af);
REGISTER_FILTER (ARESAMPLE, aresample, af);
REGISTER_FILTER (ASELECT, aselect, af);
REGISTER_FILTER (ASENDCMD, asendcmd, af);
REGISTER_FILTER (ASETNSAMPLES, asetnsamples, af);
REGISTER_FILTER (ASETPTS, asetpts, af);

4
libavfilter/version.h
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@ -29,8 +29,8 @@
#include "libavutil/avutil.h"
#define LIBAVFILTER_VERSION_MAJOR 3
#define LIBAVFILTER_VERSION_MINOR 26
#define LIBAVFILTER_VERSION_MICRO 102
#define LIBAVFILTER_VERSION_MINOR 27
#define LIBAVFILTER_VERSION_MICRO 100
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \

107
libavfilter/vf_select.c
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@ -27,6 +27,7 @@
#include "libavutil/fifo.h"
#include "libavutil/internal.h"
#include "avfilter.h"
#include "audio.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
@ -62,6 +63,10 @@ static const char *const var_names[] = {
"TOPFIRST",
"BOTTOMFIRST",
"consumed_samples_n",///< number of samples consumed by the filter (only audio)
"samples_n", ///< number of samples in the current frame (only audio)
"sample_rate", ///< sample rate (only audio)
"n", ///< frame number (starting from zero)
"selected_n", ///< selected frame number (starting from zero)
"prev_selected_n", ///< number of the last selected frame
@ -101,6 +106,10 @@ enum var_name {
VAR_INTERLACE_TYPE_T,
VAR_INTERLACE_TYPE_B,
VAR_CONSUMED_SAMPLES_N,
VAR_SAMPLES_N,
VAR_SAMPLE_RATE,
VAR_N,
VAR_SELECTED_N,
VAR_PREV_SELECTED_N,
@ -174,6 +183,9 @@ static int config_input(AVFilterLink *inlink)
select->var_values[VAR_INTERLACE_TYPE_T] = INTERLACE_TYPE_T;
select->var_values[VAR_INTERLACE_TYPE_B] = INTERLACE_TYPE_B;
select->var_values[VAR_SAMPLE_RATE] =
inlink->type == AVMEDIA_TYPE_AUDIO ? inlink->sample_rate : NAN;
if (CONFIG_AVCODEC && select->do_scene_detect) {
select->avctx = avcodec_alloc_context3(NULL);
if (!select->avctx)
@ -231,13 +243,6 @@ static int select_frame(AVFilterContext *ctx, AVFilterBufferRef *picref)
AVFilterLink *inlink = ctx->inputs[0];
double res;
if (CONFIG_AVCODEC && select->do_scene_detect) {
char buf[32];
select->var_values[VAR_SCENE] = get_scene_score(ctx, picref);
// TODO: document metadata
snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
av_dict_set(&picref->metadata, "lavfi.scene_score", buf, 0);
}
if (isnan(select->var_values[VAR_START_PTS]))
select->var_values[VAR_START_PTS] = TS2D(picref->pts);
if (isnan(select->var_values[VAR_START_T]))
@ -248,34 +253,63 @@ static int select_frame(AVFilterContext *ctx, AVFilterBufferRef *picref)
select->var_values[VAR_POS] = picref->pos == -1 ? NAN : picref->pos;
select->var_values[VAR_PREV_PTS] = TS2D(picref ->pts);
select->var_values[VAR_INTERLACE_TYPE] =
!picref->video->interlaced ? INTERLACE_TYPE_P :
switch (inlink->type) {
case AVMEDIA_TYPE_AUDIO:
select->var_values[VAR_SAMPLES_N] = picref->audio->nb_samples;
break;
case AVMEDIA_TYPE_VIDEO:
select->var_values[VAR_INTERLACE_TYPE] =
!picref->video->interlaced ? INTERLACE_TYPE_P :
picref->video->top_field_first ? INTERLACE_TYPE_T : INTERLACE_TYPE_B;
select->var_values[VAR_PICT_TYPE] = picref->video->pict_type;
select->var_values[VAR_PICT_TYPE] = picref->video->pict_type;
if (CONFIG_AVCODEC && select->do_scene_detect) {
char buf[32];
select->var_values[VAR_SCENE] = get_scene_score(ctx, picref);
// TODO: document metadata
snprintf(buf, sizeof(buf), "%f", select->var_values[VAR_SCENE]);
av_dict_set(&picref->metadata, "lavfi.scene_score", buf, 0);
}
break;
}
res = av_expr_eval(select->expr, select->var_values, NULL);
av_log(inlink->dst, AV_LOG_DEBUG,
"n:%d pts:%d t:%f pos:%d interlace_type:%c key:%d pict_type:%c "
"-> select:%f\n",
"n:%d pts:%d t:%f pos:%d key:%d",
(int)select->var_values[VAR_N],
(int)select->var_values[VAR_PTS],
select->var_values[VAR_T],
(int)select->var_values[VAR_POS],
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_P ? 'P' :
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_T ? 'T' :
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_B ? 'B' : '?',
(int)select->var_values[VAR_KEY],
av_get_picture_type_char(select->var_values[VAR_PICT_TYPE]),
res);
(int)select->var_values[VAR_KEY]);
select->var_values[VAR_N] += 1.0;
switch (inlink->type) {
case AVMEDIA_TYPE_VIDEO:
av_log(inlink->dst, AV_LOG_DEBUG, " interlace_type:%c pict_type:%c",
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_P ? 'P' :
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_T ? 'T' :
select->var_values[VAR_INTERLACE_TYPE] == INTERLACE_TYPE_B ? 'B' : '?',
av_get_picture_type_char(select->var_values[VAR_PICT_TYPE]));
break;
case AVMEDIA_TYPE_AUDIO:
av_log(inlink->dst, AV_LOG_DEBUG, " samples_n:%d consumed_samples_n:%d",
(int)select->var_values[VAR_SAMPLES_N],
(int)select->var_values[VAR_CONSUMED_SAMPLES_N]);
break;
}
av_log(inlink->dst, AV_LOG_DEBUG, " -> select:%f\n", res);
if (res) {
select->var_values[VAR_PREV_SELECTED_N] = select->var_values[VAR_N];
select->var_values[VAR_PREV_SELECTED_PTS] = select->var_values[VAR_PTS];
select->var_values[VAR_PREV_SELECTED_T] = select->var_values[VAR_T];
select->var_values[VAR_SELECTED_N] += 1.0;
if (inlink->type == AVMEDIA_TYPE_AUDIO)
select->var_values[VAR_CONSUMED_SAMPLES_N] += picref->audio->nb_samples;
}
select->var_values[VAR_N] += 1.0;
return res;
}
@ -339,6 +373,38 @@ static int query_formats(AVFilterContext *ctx)
return 0;
}
#if CONFIG_ASELECT_FILTER
static const AVFilterPad avfilter_af_aselect_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.get_audio_buffer = ff_null_get_audio_buffer,
.config_props = config_input,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad avfilter_af_aselect_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ NULL }
};
AVFilter avfilter_af_aselect = {
.name = "aselect",
.description = NULL_IF_CONFIG_SMALL("Select audio frames to pass in output."),
.init = init,
.uninit = uninit,
.priv_size = sizeof(SelectContext),
.inputs = avfilter_af_aselect_inputs,
.outputs = avfilter_af_aselect_outputs,
};
#endif /* CONFIG_ASELECT_FILTER */
#if CONFIG_SELECT_FILTER
static const AVFilterPad avfilter_vf_select_inputs[] = {
{
.name = "default",
@ -362,7 +428,7 @@ static const AVFilterPad avfilter_vf_select_outputs[] = {
AVFilter avfilter_vf_select = {
.name = "select",
.description = NULL_IF_CONFIG_SMALL("Select frames to pass in output."),
.description = NULL_IF_CONFIG_SMALL("Select video frames to pass in output."),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
@ -372,3 +438,4 @@ AVFilter avfilter_vf_select = {
.inputs = avfilter_vf_select_inputs,
.outputs = avfilter_vf_select_outputs,
};
#endif /* CONFIG_SELECT_FILTER */